Given a positive integer (n), this calculates Euler‘s totient, also known as φ

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- φ(n) = All numbers less than n which only have 1 as a common factor

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- eulers totient (φ)
- factor
- a divisor of an integer n, also called a factor of n, is an integer m that may be multiplied by some integer to produce n.
- phi
- A letter of the greek alphabet used for math notation.

Φ φ - prime number
- a natural number greater than 1 that is not a product of two smaller natural numbers.
- totient
- The number of positive integers not greater than a specified integer that are relatively prime to it